On 1.7.0 I am getting better hashrate
my rx 580 4gb get about 10 H/s more on v8 (from 990 to 1000)
but my rx 570 4gb get about 40 H/s more on v8 (from 945 to 985)

For 5 cards (3x570 and 2x580) my hashrate went up for about 140 H/s compared to 1.6.9 with same settings but power consumption also increased for about 30W (from 630W to 660W).
Also my 570's are getting to much memory errors now, so I will need to lower intensity on v8.
For fast algo I am getting about 200H/s less compared to 1.6.9. with same settings.